Drawing frame



April 8, 1924. mwm

- H. WERNING DRAWING FRAME Patente Apr. 8, 1924 HEINRICH WERNING, OEF NORDI-IORN', GERMANY, ASSIGNOR TO FRIED. KR'UPP .AKTIEN- GESELLSOHAFT, OF ESSEN-ON-THE-RUHR, GERMANY.

DRAWING FRAME.

Application filed January 8, 1923. Serial No. 611,417.

To all whom it may concern:

Be it known that I, HEINRICH WERNING, residing at Nordhorn, in Hanover, Germany,

a citizen of the German Republic, have in- 5 vented a certain new and useful Improvement in Drawing Frames, of which the following is a specification.

This invention relates to drawing frames of the kind comprising three pairs of rolls, and it has for its object to provide a drawing frame of this kind by the use of which the quality of the yarn to be spun is im proved and the output of the machine increased.

According to the invention, this object is attained by arranging the three pairs of rolls in such a manner with relation to each other that the straight line of touch of the intermediate pair of rolls is situated outside a plane determined by the straight line of touch of the two outer pairs of rolls.

The accompanying drawing illustrates, as an embodiment of the subject matter of the invention, a side elevation of a drawing frame and of the neighboring parts of a ring spinning machine in connection with which the drawing frame is designed tobe used. The relative speed of the lower rolls is indicated in the drawings by means of outline circles which represent the approximate size of the driving gears.

The drawing frame comprises three fluted lower rolls A, B and C mounted for rotation in a bearing H, as well as three smooth upper rolls D, E and F which rest on the lower rolls and are mounted for rotation in guides g of a bearing G. The axes. of rotation of allrolls are parallel with relation toone another. The distance between the lines of touch of the front and intermediate pair of rolls is smaller than the average fibre length of the cotton to be spun. At the same time the axis of rotation of the front upper roll D is given such a position as to cause aplane determined by the two parallel axes of rotation of the rolls A and D to form with relation to a plane determined by the two parallel axes of rotation of the rolls B and E an acute angle a as indicated in the drawing. The bearing G of the upper rolls D, E and F is pivotally connected to the bearing H of the lower rolls by means ofa pin J. The bearing H of the lower :rolls iscarried by a standard 10 which,in turn, rests on the table K of the ring spinning machine. The position of the axes of rotation of the two intermediate rolls B and E 'as well as their diameters are of such a kind thatthe straight line of touch of these rolls extends underneath a plane which is determined by the straight lines of touch of the two outer pairs of rolls A, D and C, F. The rear and the intermediate upper roll, E and F, load the corresponding lower rolls C and B by their own weight only. As to the front pair of rolls, however, the lower roll A is not only loaded by the own weight of the upper roll D but also by an additional weight M which is connected with the upper roll D through the intermediary of a hook N engaging an annular groove of the upper roll D, and of a member N of a shape similar to a chain link. The sliver P to be drawn is passed through between the upper rolls (not shown) in such a manner as to cause the sliver P to be drawn through the drawing frame and stretched thereby. The circumferential speed of the rolls B, E of the intermediate pair of rolls is only by a small amount higher than the circumferential speed of the rolls C, F of the rear pair of rolls, so that the sliver P will only be slightly drawn on the way between these two pairs of rolls. of the rolls A, D of the front pair of rolls, however, is much greater than that of the rolls B, E of the intermediate pair of rolls, this increase of speed being so high as to produce a considerable drawing out of the sliver P between the intermediate and thefront pair of rolls B, E and A, D, respectively. The draft determining the drawing of the sliver and employed in the whole drawing frame, can be set to adopt the value 20 or even higher values. The downward deflec- The circumferential speed tion to which the sliver P is subjected owing to the described arrangement and construction of the intermediate pair of rolls B, E,

will cause the sliver P to touch the intermediate upper roll E along an are beginning before and ending behind the clamping point 6 and will further cause the sliver to bear on the front lower roll A likewise along an are on its way from a point a where it passes onto the roll A, up to the clamping point a which lies on the line of connection of the axes of rotation of the two front rolls A, D. As experience has shown, this areshaped contact will cause the several fibres of the sliver]? to be much better guided during the process of drawing by the intermediate upper roll E as well as by the front lower roll A and, consequently, a much more evened sliver will be obtained than on the well-known drawing frames which do not show this kind of guiding. a

On account of the said arc-shaped con- .tact between the intermediates upper roll E and the sliver P which is in strained condition during the operation, the sliver will, besides, tend to lift the intermediate upper roll E in its guides 9 The intermediate upper cylinder E may therefore be made ofa relatively large weight without running the risk of involving a too strong clamping of the sliver. Now, this increase of the weight of the intermediate upper roll has a very favorable action on the thread-formation in the drawing frame inasmuch as a particularly steady rotation and resting of the intermediate upper roll it on the corresponding lower roll is attained thereby. This is of particular importance when inserting. a new sliver bobbin, since the steady resting and rotating of the intermediate upper roll E on the corresponding lower roll will avoid many thread-ruptures which, as experience has shown, otherwise very easily occur after the insertion of a new sliver bobbin under the influence of an unequal rotation of the intermediate upper roll.

As already stated, the described construction and arrangement of the two intermediate rolls B, E cause the sliver P to touch the front lower roll A on an are a a which has a favorable action on the thread-formation, this arc-shaped contact taking also place in case the front upper roll D will be arranged so that the acute angle 0:, indicated in the drawing, will adopt the value of 0. However, the arrangement of the front upper roll D chosen for the embodiment shown, will produce in combination with the described construction and arrangement of the two intermediate rolls B, E the special advantage that the are a a is made longer, thereby further improving the guiding of the sliver P by the front lower roll A. An other advantage attained by the arrangement of the front upper roll D as disclosed by th pressent embodiment, resides in the fact that the are extending from the clamping point a to the delivery point a is considerably shortened. This shortening of the are a a is particularly advantageous because a large number of thread-ruptures will be avoided thereby. It has to be borne in mind that the thread-ruptures are particularly numerous on the are extending from the clamping point a to the delivery point a because the sliver P is only drawn out but not twisted on this part of its length on which it possesses only a small cross-section and therefore opposes to the pulling force exerted by the ring-spindle less resistance against rupture than on the part which extends from the delivery point a to the ringspindle, on which last-mentioned part it is at the same time twisted around its longitudinal axis. I

The contemplated decrease of the number of thread-ruptures by the drawing frame forming the subject matter of the invention, affords a corresponding increase of the output of the spinning machine which is provided with the present drawing frame. Another material increase of the output is moreover attained by the use of the drawing frame forming the subject matter of the invention, inasmuch as the high draft which is made use of in the drawing frame, will allow a very coarse sliver or roving to be spun in one operation into a fine yarn, so that one of the operations which has otherwise to be undergone in the slubbing process may bedispenscd with. When installing new spinning-mills, the said circumstance will render it possible to keep th number of slubbing machines very low, and in existing spinning-mills which should be subsequently provided with the drawing frame forming the subject matter of the invention, it will be possible to enlarge the spinningmill by a number of spinning machines corresponding to the number of slubbing machines which become dispensable. As regards such a rebuilding of an already existing spinning-mill considerably increasing its efficiency, the drawing frame according to the present invention is particularly adapted because it can be readily applied to existing spinning machines at a relatively small expenditure of work and at low costs.

If, in the use of the present drawing frame, it should be desired to dispense with one of the operations of the slubbing process, possibility is given for considerably reducing the draft on the several slubbing machines. This will be of advantage in case it is desired to spin a yarn of particularly good qualities, experience having shown that the said reduction of draft on the several slubbing machines will materially improve the qualities of the yarn to be spun.

Claim: The foregoing specification signed at A drawing frame comprising three suc- Bremen, Germany, this 8th day of Decem- 10 cessively arranged pairs of rolls for acting ber, 1922. on the sliver, the straight lines of touch of 5 the tWo outer pairs of rolls lying in one HEINRICH WERNING' common plane and the straight line of touch Witnesses: of the intermediate pair 0 rolls lying un- FRANCIS J. DUGAN,

derneath the said plane. CARI/ION HURST. 

